Adjustable derrick



(No Modl.)

E B. STEELE.

ADJUSTABLE DERRICK.

No. 402,201. Patented Apr. 30', 1889.

N. PETERS. PPwlvl-ilhomphar. Vailhinglbfl. E Q

UNITED STATES PATENT OFFICE.

EDIVIN B. STEELE, OF ADRIAN, MICHIGAN ADJUSTABLE DERRICK.

SPECIFICATION forming part of Letters Patent No. 402,201, dated April30, 1889.

Application filed November 1888. Serial No. 290,060. (No model.)

To all whom it nwycorwerm Be it known that I, EDWIN B. STEELE, a citizenof the United States, residing at Adrian, in the county of Lenawee andState of Michigan, have invented certain new and useful Improvements inAdjustable Derricks, of which the following, in connection with theaccompanying drawings, is a specification sufliciently clear to enablethose skilled in the art to which my invention belongs to make and usethe same.

My invention relates particularly to derricks which are adapted to besecured in the frames of windows or doors of buildings, and has for itsobject to provide a simple and cheap device which can be readilyadjusted to any width of window or door, as will be fully described,andparticularly pointed out in the claims.

In the accompanying drawings, Figure 1 represents a front view of abuilding having my improved derrick in place in the windowopening. Fig.2 is a vertical central section of Fig. 1. Fig. 3 is a top view of aportion of the derrick, illustrating the bar by which the properdistance between the trusses or sec tions is maintained; and Fig. t is ahorizontal section on line a m, Fig. 2.

A represents the outside wall of a build: ing having window-openings,with the sill B, on which my improved derrick is supported. The latterconsists, substantially, of the upright posts 0, the braces D and F, andthe tie-beam E, all jointed and firmly secured to each other by suitablemeans. To the lower end of the post G is attached a shoe, G which findsa bearing on the window-sill B and serves as the main support for thederricksection. At the upper end of the post 0, I provide a slide, G,which is flattened at its rear portion, in order to slide between thepost 0 and the holding plate O and which at its rear extremity is bentso as to form a hook, G adapted to rest against the inside of the wallor window, while its outer end is in the form of a bolt, and projectsthrough the brace D centrally, and is provided with a nut, G whichscrews up against the washer-plate D. By this construction I am enabledto adapt my derrick to any width of wall, as by merely turning the nut GI can slide the bolt back far enough to allow the rear hooked end of thesame to take a grip on the inner edge of the wall, and thus hold thesection firmly at its upper portion, while the lower end rests with theshoe C on the sill B. In order to retain the lower end in properposition on the sill B, I provide an additional slide, II, having a rearhooked portion, and having at its forward end a slot, H through whichthe bolt I-I passes, and is clamped in position by means of thethumb-nut II. (See Fig. 1.) Similarly to the bolt G, I hold the slide IIin place by a holding-plate, 0 as shown in Fig. 2. v

The parts so far described form a section of the derrick, one sectionbeing intended for each side of the window or door opening, and eachbeing adapted to be secured in place independently of the other, as willbe clearly understood.

At the top of the sections and at proper distance from the wall I placea bracket, I, hav ing a retaining-plate, I, hinged at its front upperend, and a bolt, I extending through said hinged plate I and providedwith a thumb-nut, I, to secure the plate I. Within the openings formedby the bracket I, plate I, and bolt I I place the bar K, which isprovided with notches K I to receive the bolts Rand when secured to thebrackets I, by means of the plate I being screwed tight unto the bar K,a firm and uniform distance between the sections will be maintained,While at the same time the sections are prevented from swaying onaccount of friction between the plates I and the bar K. About midwaybetween the ends of the bar K is provided an eyebolt or hook, J, fromwhich a pulleytackle, J, or any other desired device maybe suspended.(See Fig. 2.) I

If a heavy load is to be lifted and the walls of the buildings shouldnot be strong enough to sustain the weight on the bar K, a safetyrope,L, may be secured to the main brace D at one end, while the other endmay be se cured to the flooring or other stationary article by means, ofeyebolts or other suitable means. It will thus be readily seen that-thestrain would be taken off from the bolts G and the outerwall andtransferred to a firmer base.

What I claim as new, and desire to secure by Letters Patent, is-

1. The combination of a frame comprising an upright post adapted to restagainst the outside of the wall and inclined braces connected at theirupper ends to each other and attached at their lower ends to the upperand lower parts, respectively, of said post, horizontal slidesadjustable in said frame and provided with hooks at their inner ends forengaging the wall, and bolts having nuts for adjusting said slides.

2. The combination of an upright post provided with a sill-shoe,inclined braces connected at their upper ends to each other and attachedat their lower ends to the npperand lower parts, respectively, of saidpost, a horizontal slide near the upper end of said post provided with ahook at its inner end for e11- gaging the wall and a bolt-shaped outerend extending through the outer brace, a washer on the outer brace, anda nut on said bolt. end for adjusting the slide.

The combination of an upright post, inclined braces connected at theirupper ends to each other and attached at theirlower ends to the upperand lower parts, respectively, of said post, a horizontal slide near theupper end of said post provided with a hook at its inner end forengaging the wall and with a bolt-shaped outer end extending through theouter brace, a washer on the outer brace and a nut on said bolt end foradjusting the slide, and an adjustable horizontal slide near the lowerend of said post provided with a hook at its inner end.

4. The combination of an upright post, in-

clined braces connected at their upper ends to each other and attachedattheirlowor ends to the upper and lower parts, respectively, of saidpost, a horizontal slide near the upper .end of said post provided witha hook at its inner end for engaging the wall and with a bolt-shapedouter end extending through the outer brace, a washer on the outerbrace, a nut on said bolt for adjusting the slide, an adjustablehorizontal slide near the lower end of said post provided with a hook atits inner end and a slot at its outer end,a bolt extending through saidslot and through the lower end of said outer brace, and a thumb-nut onsaid bolt.

5. The combination of two adjustable window derrick-sections adapted tobe secured to the wall of a building, a cross-bar provided with notchesnear its ends, and bolts in said sections engaging said notches forsecuring the bar and sections together.

6. The combination of two adjustable window-derrick sections adapted tobe secured to the wall of a building and provided with brackets havinghinged plates, a bar for connecting said sections resting in saidbrackets and provided with notches near its opposite ends, and boltspassing through said hinged plates, notches, and brackets, substantiallyas described.

EDWIN n. STEELE,

\Vitn esses:

CHAS. F. SoHMELz, NELLIE J. WATTIE.

